KinematicCollision2D is overriden even though the variable isn't reassigned

[KoBeWi]

Godot version:
3.2 and 7724b84

Issue description:
Look at this code:

extends KinematicBody2D

var global_col: KinematicCollision2D

var dir := Vector2.RIGHT * 2

func _physics_process(delta: float) -> void:
	var col := move_and_collide(dir)
	if col:
		dir.x = -dir.x
		if not global_col:
			print("------------------------")
			global_col = col
	
	if global_col:
		print(global_col.collider.name)

You can clearly see that global_col is assigned only once (------ indicates it) and from a local variable. However every time col gets a new value, global_col is modified too. AFAIK that's not how references work.

Minimal reproduction project:
TestProject.zip

EDIT:
Ok, for whatever reason KinematicBody2D reuses and returns the same collision every time. Any reason it's like this? It should at least return a duplicate.

[Xrayez]

You mean that whatever is returned by move_and_collide() is the same internal reference to KinematicCollision2D somewhere within KinematicBody2D? If that's the case perhaps that's due to performance reasons.

It would be nice to have KinematicCollision2D as a property then, or adding a method which can retrieve this reference outside of the move_and_collide() call, something akin to get_collision() similarly to get_slide_collision(), and perhaps is_colliding() as in a raycast.

[KoBeWi]

You mean that whatever is returned by move_and_collide() is the same internal reference to KinematicCollision2D somewhere within KinematicBody2D?

Yes. At first I thought it's some bug related to references, but the returned collision is the same object actually.

If that's the case perhaps that's due to performance reasons.

The collision is a simple struct, so I doubt it's about performance. It might just be needed somewhere else, but still, the returned collision should be unique. So duplicating it on demand would be a good idea IMO.

[KoBeWi]

Still valid in bccbd4b